Boom-swinging machine



No. 748,691. PATENTED JAN. 5, 1904.

' J. BIRD.

' BOOM SWINGING MACHINE.

APPLIOATION FILED MAY 14 1903. N0 MODEL. 2 SHEETS-SHEET 1.

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No. 748,691. PATENTED JAN. 5, 1904.

J. BIRD.

BOOM SWINGING MACHINE.

APPLICATION FILED MAY 14.1903.

HO MODEL. 2 SHEETS-SHEET 2.

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UNITED STATES Patented January 5, 1904.

PATENT OFFICE.

JOHN BIRD, OF ROOKLAND, MAINE, ASSIGNOR TO CAMDEN ANCHOR- ROCKLAND MACHINE COMPANY, OF ROGKLAND, MAINE.

BOOM-SWINGING MACHINE.

SPECIFICATION forming part of Letters Patent No. 748,691, dated January 5, 1904.

Application filed May 14, 1903.

To all whom it may concern:

Be it known that I, JOHN BIRD, a citizen of the United States, residing at Rockland, county of Knox, State of Maine,have invented certain new and useful Improvements in Boom-Swinging Machines, of which the following is a specification, reference being had therein to the accompanying drawings, in which- I Figure 1 is a front elevation of the machine; Fig. 2, a plan view thereof; Fig. 3, a vertical longitudinal sectional view taken on the line III III of Fig. 2, and Fig. 4 a vertical longitudinal sectional view of the drum and its shaft.

The main object of this invention is to provide a machine by which a derrick-boom may be swung to the right or to the left by means of one winding-drum, mechanism being provided by which said drumm-ay be rotated in either direction for this purpose.

A further object of the invention is to provide a simple friction means by which the direction of the rotation of the drum may be easily and quickly reversed.

Other important objects and advantages of the invention will appear hereinafter.

Referring to the various parts by numerals, l designates a substantial supporting-base on- Which the vertical side frames 2 are mounted. On these frames, near the rear ends thereof, is mounted a main driving-shaft 3, to one end of which is rigidly secured a main gear 4:. Meshing with this gear is a smaller gear 5, mounted on a shaft 6, which shaft maybe driven by any suitable motor, such as a h0ist ing-engine. On the main shaft 3 between the side frames are mounted two large driving-gears 7 and 8, one of said gears being near each side frame and the gear 8 being somewhat larger than the gear 7. On the side frames near their forward ends is journaled a drum-shaft 9, on which between the frames are loosely mounted two drum-gears 10 and 11, the latter. gear being larger than gear 10 and meshing directly with gear 8 of the main driving-shaft. The gear 10 meshes with a small pinion 12, mounted on a shaft 13, journaled in the side frames, and this pinion 12 meshes with the gear 7 of the main shaft. It is obvious that when the main shaft is rotated the gears 10 and 11 of the drum- Serial No. 157,048. (No model.)

shaft will be rotated in opposite directions and at the same speed, the gears 7 and 10 be ing of the same diameter and the gears 8 and 11 also being of the same diameter, though larger than gears 7 and 10.

To the inner face ofveach of the gears 10 and 11 is rigidly bolted an inward-tapered friction ring or block 14, of wood, which is adapted to fit within a correspondingly-tapered recess 15 in the ends of a boom-swinging drum 16. This drum is rigidly secured to the drum-shaft between the gears 10 and 11 by means of a large key 17, the outer ends of said drum extending near to the inner faces of the said gears. Each end of the drumshaft is bored axially to receive a thrust-rod 18, Whose outer end rests in a recess 19, formed in.the inner end of the thrust-screw 20. This thrust-screw is mounted in a correspondinglythreaded thrust block 21, which is rigidly bolted to the side frame. To the outer end of the thrust-screw issecured an operating-arm 22, to one end of which is secured an operating-rod 23, the other end of this red being carried to a suitable point to enable the engineer or other person operating the hoisting-motor to manipulate it,and thereby rotate the thrustscrew in either direction. Each thrust-rod 18 near its inner end bears against a transverse bar 24, which extends through a transverse slot 24:, formed in the drum-shaft. The inner edge of this bar bears against the outer face of a collar 25, whose inner face bears against the outer face of a bearing-bushing 26, secured to the adjacent drum-gear. It is of course evident that this collar 25 may bear directly against the outer face of the gear, if desired. The operation of this thrust mechanism is obvious. By rotating the thrust-screwin the proper direction the transverse bar 24 will be forced inward, causing a corresponding inward movement of the gear and its frictionblock. This inward movement will force the friction-block within the adjacent tapered recess in the drum and cause the drum and the gear attached to said friction-block to ro-. tate in the same direction. A reverse movement of the thrust-screw will, as is obvious, release the friction-block from the drum and permit the gear to rotate freely on the drumshaft. It is therefore clear that as the gears 10 and 11 are rotating in opposite directions the desired direction of rotation for the drum may be secured by throwing inward the gear which is rotating in the proper direction. Thrust-springs 30 are interposed between the inner walls of the recess 15 of the drum and the inner faces of the gears 10 and 11 to quickly release the friction-blocks from the drum when the thrust-screws are moved outward. It is obvious that by means of this friction drivingear the boom-swinging dru m may be rotated in the desired direction without any sudden strain being put on the boomcable. It is also manifest that while the drumgears may be rotated at a constant speed the speed of rotation of the drum may be very nicely controlled by means of the frictionblocks 14. The drum will be gradually started and gradually stopped,so that the derrickboom will move slowly at first and after having reached its greatest speed will be gradually slowed down without any special care being exercised by the engineer.

In the transverse bar 24 are inserted retaining-pins 27, which hold the said bar in the slot of the drum-shaft. Thrust-bearings 28 are provided for the drum-shaft to prevent any lateral movement of said shaft in its bearings.

From the foregoing it will be readily seen that I provide a very simple and efficient boomswinging machine which is well adapted for the purpose for which it is designed.

Having thus described my invention, what I claim as new,and desire to secure by Letters Patent, is Y 1. A boom-swinging machine comprising,a main driving-shaft, a pair of drivinggears mounted thereon, a drum-shaft, a pair of drum-gears loosely mounted thereon and carrying friction-blocks on their inner faces, a drum rigidly mounted on said drum-shaft between the gears said drum being adapted to be engaged by the friction-blocks on the drumgears, means whereby the driving-gears will rotate the drum-gears in opposite directions, and means for independently forcing inward the drum-gears to cause the friction-blocks to independently engage the drum, whereby said drum may be rotated in either direction.

Aboom-swinging machine comprising, a main shaft, a pair of driving-gears mounted thereon, a drum-shaft, a pair of drum-gears loosely mounted thereon, a friction-block secured to the inner face of each drum-gear, a drum rigidly mounted on the drum-shaft between the gears and adapted to be engaged by the friction-blocks of said gears, means whereby the drivinggears will rotate the.

drum-gears in opposite directions, a thrustscrew mounted in each end of the drumshaft, means for rotating each of said thrustscrews, and devices moved by said thrustscrews to force inward the drum-gears, substantially as described.

3. A boo m-swinging machine comprising, a main shaft, a pair of driving-gears mounted thereon, a drum-shaft, a pair of drum-gears loosely mounted thereon, a friction-block secured to the inner face of each drum, a drum rigidly mounted on the drum-shaft between the gears and adapted to be engaged by the friction-blocks of said gears, means whereby the driving-gears will rotate the drum-gears in opposite directions, a thrust-screw mounted in each end of the drum-shaft, means for rotating each of said thrust-screws, devices moved by said thrust-screws to force inward the drum-gears, a thrust-rod for each of said thrust-screws, and means whereby each of said'thrust-rods may be caused to force inward the adjacent drum-gear.

4:. A boom-swinging machine comprising, a main shaft, a pair of drivingears thereon, a drum-shaft, a pair of drum-gears loosely mounted thereon, friction-blocks connected to said drum-gears and extending inward from the inner faces thereof, a drum rigidly mounted on the drumshaft between the gears, and means whereby the friction-blocks may be caused to independently engage the drum.

5. A boomswinging machine comprising, a main shaft, a pair of driving-gears thereon, a drum-shaft, a pair of drum-gears loosely mounted thereon, friction-blocks connected to said drum-gears and extending inward from the inner faces thereof, a drum rigidly mounted on the drum shaft between the gears, means whereby the friction-blocks may be caused to independently engage the drum, a transverse bar extending through the drumshaft near each drum-gear, and engaging the outer face of said gear, a thrust-rod for each of said bars the inner ends of said rods bearing against said bars, a thrust-screw engaging each thrust-rod, whereby said bar may be forced inward by the thrust-screw.

6. A boom-swinging machine comprising, a main shaft, a pair of driving-gears thereon one of said gears being larger than the other,

a drum-shaft, a pair of drum-gears mounted thereon one of said gears being larger than the other and the larger one meshing with the larger driving-gear, a small pinion interposed between the smaller driving-gear and the smaller drum-gear, whereby the drumgears will be rotated in opposite directions and at the same speed, friction-blocks secured to the inner surfaces of the drum-gears, a drum rigidly secured to the drum-shaft between the drum-gears, thrust-bearings for the drum-shaft, and an independently-adjustable thrust mechanism mounted at each end of the drum-shaft and adapted to force inward the adjacent drum-gear, whereby said drum may be rotated in either direction.

In testimony whereof I hereunto affix my signature, in the presence of two witnesses, this 27th day of April, 1903.

JOHN BIRD.

Witnesses:

O. H. EMERY, F. T. HYLER. 

